Docker Interview Questions and Answer Part – 32

Which of the following are true about Docker volumes?

• They must exist on a SAN or NAS
• They are decoupled from containers (Ans)
• They are higher performance than graph driver (snapshotter) storage
• They are RAID protected

Which of the following commands will list all of the Docker volumes on a particular Docker host?

• docker system info | grep volumes
• docker node volumes
• docker volume ls (Ans)

Which of the following can be a Docker Secret?

• Just SSH keys
• Just .pem and .crt files
• Passwords less than 100KB
• Passwords, SSH keys, service ports and names (Ans)

Which component of the Docker Engine interfaces with the kernel primitives that are used to build containers?

• The OCI layer (runc) (Ans)
• The REST API
• The Docker daemon

What currently replaces containerd and the OCI layer in the Docker Engine on the Windows platform?

• The smss process
• The Compute Services Layer (Ans)
• The Windows Registry
• Hyper-V

How do you tell Docker on Windows to deploy a container as a Hyper-V container?

• Build the image with the isolation=hyperv tag
• Use the hyper-v container run command instead of the docker container run command
• Pass the docker container run command the --isolation=hyperv switch (Ans)

What are some of the features of Docker Universal Control Plane?

• Docker Content Trust (DCT)
• Management of containers and virtual machines via a single web UI
• RBAC, image scanning, image promotions (Ans)

Which of the following explains the relationship between a Docker image and a Docker container?

• A Docker container is two or more images that share a common execution environment
• A Docker container is used to start a Docker image
• A Docker container is a collection of image layers
• A Docker container is a running instance of an image (Ans)

Which of the following commands will initialize a new Swarm on the current node?

• docker swarm init (Ans)
• docker swarm create
• docker init

Which Dockerfile instruction sets the default program for a container to run, but can be overridden on the CLI at runtime?

• ENTRYPOINT
• RUN
• CMD (Ans)

Where do you specify the default logging driver for all containers on a particular Docker host?

• logs.json
• daemon.json
• The Registry
• config.json (Ans)

What underlying Windows technology, used to build containers, is broadly referred to as control groups?

• The Registry
• Hyper-V
• Active Directory
• Job objects (Ans)

Which of the following Docker Engine components is part of the Open Container Initiative (OCI)?

• runc (Ans)
• containerd
• The API
• The daemon

Which component of the Docker Engine implements the Docker API?

• The Docker daemon (Ans)
• The Docker client
• The OCI layer
• containerd

Which of the following is needed to deploy a Docker Stack?

• Compose v2 file format
• Kubernetes
• Compose v3 file format (Ans)
• Docker Cloud

What is the name of the configuration file that describes how to build a new Docker image with your app-code inside?

• dockerfile (Ans)
• config.json
• docker-file
• dockerfile.json

Which of the following is the worst number of managers for high availability?

• 1
• 5
• 2 (Ans)
• 7

Which command can you use to get a shell session inside of a container?

• docker container login
• docker container exec (Ans)
• docker container shell
• docker container ssh

Which Docker EE technology performs layer-7 (application layer) load balancing?

• The ingress network
• The Service Mesh
• The HTTP Routing Mesh (HRM) (Ans)

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